scholarly journals Evaluation of the Physical-Mechanical Properties of Type IV Gypsum

2021 ◽  
Vol 23 (1) ◽  
pp. 07-11
Author(s):  
Mariana Elias Queiroz ◽  
Juliana Santos Proença ◽  
Edwin Fernando Ruiz Contreras
Keyword(s):  
Surface Roughness ◽  
Dental Materials ◽  
Metallic Matrix ◽  
Physical Property ◽  
Type Iv ◽  
Irreversible Hydrocolloid ◽  
Kolmogorov Smirnov ◽  
Group 3 ◽  
Group 2 ◽  
Non Parametric

AbstractThe purpose of this study was to evaluate a physical property (surface roughness) and a mechanical property (microhardness) of four type IV gypsum. 40 specimens were prepared from a metal matrix that reproduced an edentate upper alveolar ridge. They were divided into 4 groups (n = 10 Clone (G3), Durone(G4), SSWhite (G2), Asfer (G1) and submitted to roughness and microhardness tests . The obtained data were submitted to statistical analysis. By the Kolmogorov-Smirnov test it was verified that there was non-parametric distribution of the samples. The non-parametric Kruskal-Wallis and Mann-Whitney-U tests were applied in hardness and roughness data. In microhardness group 3(Clone) presented the best values (103.0 HV). In surface roughness (Ra), group 3(Clone) and Group 2 (SSWhite) showed the lowest values (1.8 m) and all evaluated groups presented higher values than those found in metallic matrix (baseline). It was concluded that gypsum models obtained from molds with irreversible hydrocolloid are rougher than molded surface, regardless of the commercial brand. The samples made with the Clone gypsum (G3) have the highest microhardness. Keywords: Calcium Sulfate. Hardness. Dental Materials. ResumoO objetivo desse trabalho foi avaliar uma propriedade física (rugosidade superficial) e uma propriedade mecânica (microdureza) de quatro marcas comerciais de gesso tipo IV. Foram confeccionados 40 corpos de prova a partir de uma matriz metálica que reproduzia um rebordo alveolar superior edentado. Os mesmos foram divididos em 4 grupos (n=10), de acordo com as marcas comerciais (Clone, Durone, SSWhite, Asfer), e submetidos aos testes de rugosidade e microdureza superficial utilizando um rugosímetro e um microdurômetro respectivamente. Os dados obtidos foram computados e submetidos à análise estatística. Pelo teste de Kolmogorov-Smirnov verificou-se que não houve distribuição Normal das amostras. Dessa forma foram aplicados os testes não paramétricos de Kruskal-Wallis e Mann-Whitney-U em ambas as análises. Na microdureza, a marca comercial Clone apresentou os melhores valores (103,0). Já na rugosidade superficial as marcas comerciais Clone e SSWhite apresentaram os menores valores (1,8). Ainda em relação à rugosidade superficial, as marcas comerciais avaliadas apresentaram valores maiores que os encontrados na matriz metálica. Concluiu-se que modelos em gesso obtidos a partir de moldes com hidrocolóide irreversível apresentam-se mais rugosos que a superfície moldada, independente da marca comercial avaliada. Os modelos em gesso confeccionados com a marca Clone apresentam melhor microdureza superficial. Palavras-chave: Sulfato de Cálcio. Dureza. Materiais Dentários.

scholarly journals Corrosion resistance of surface modified nickel titanium archwires

2013 ◽  
Vol 84 (2) ◽  
pp. 358-367 ◽  
Author(s):  
Manu Krishnan ◽  
Saraswathy Seema ◽  
A. Vinod Kumar ◽  
N. Parvatha Varthini ◽  
Kalathil Sukumaran ◽  
...  
Keyword(s):  
Surface Roughness ◽  
Corrosion Resistance ◽  
Surface Characteristics ◽  
Group 4 ◽  
Group 3 ◽  
Group 5 ◽  
Group 2 ◽  
Surface Modified ◽  
Niti Wires ◽  
Group 1

ABSTRACT Objective: To compare the corrosion behavior of commercially available surface modified nickel titanium (NiTi) arch wires with respect to a conventional NiTi and to evaluate its association with surface characteristics. Materials and Methods: Five types of surface modified arch wires and a conventional NiTi arch wire, all from different manufacturers, were evaluated for their corrosion resistance from breakdown potential in an anodic polarization scan in Ringer's solution. Surface characteristics were determined from scanning electron microscopy, atomic force microscopy, and energy dispersive analysis. One-way analysis of variance and post hoc Duncan's multiple range tests were used to evaluate statistical significance. Results: Surface modified NiTi wires showed significant improvement in corrosion resistance and reduction in surface roughness values. Breakdown potentials increased in the order of group 6 (conventional; 204 mV) < group 1 (nitride; 333 mV) < group 5 (epoxy resin; 346mV) < group 3 (oxide; 523 mV) < group 2 (gold; 872 mV) < group 4 (Teflon; 1181 mV), but root mean square (RMS) roughness values, which indicated surface roughness, followed a different pattern: group 3 (oxide; 74.12 nm) < group 1 (nitride; 221.651 nm) < group 4 (Teflon; 278.523 nm) < group 2 (gold; 317.894 nm) < group 5 (epoxy resin; 344.236 nm) < group 6 (conventional; 578.555 nm). Conclusions: Surface modification of NiTi wires proved to be effective in improving its corrosion resistance and decreasing surface roughness. However, neither factor could maintain a direct, one-to-one relationship. It meant that the type and nature of coating material can effectively influence the anticorrosive features of NiTi wires, compared with its surface roughness values.

Arthrography in thumb polydactyly with bifurcation at the interphalangeal or metacarpophalangeal joints provides practical information at surgery

2012 ◽  
Vol 38 (3) ◽  
pp. 267-271 ◽  
Author(s):  
K. Iba ◽  
T. Wada ◽  
K. Kanaya ◽  
G. Oki ◽  
T. Yamashita
Keyword(s):  
Average Duration ◽  
Proximal Phalanx ◽  
Type Iv ◽  
Group 4 ◽  
Age At Surgery ◽  
Group 3 ◽  
Group 5 ◽  
Group 2 ◽  
Group 1

We carried out arthrography in 19 thumbs of 18 patients in whom duplication was observed at the interphalangeal (Wassel type II) or metacarpophalangeal (Wassel type IV) joints on radiographs. The average age at surgery was 12.3 months and average duration of post-surgical follow-up was 21.3 months. Based on the arthrographic findings, the types of cartilaginous connections were subdivided into five groups. In group 1, there was a cartilaginous connection at the base of duplicated phalanges. In group 2, there was a cartilaginous connection of the radial digit between the distal and proximal phalanges, or between the proximal phalanx and metacarpal. In group 3, the phalanges separated at a common joint without any cartilaginous connection. In group 4, the radial digit demonstrated fibrous attachment to the capsule without any joint formation. In group 5, each joint was completely separated without any cartilaginous connection. These arthrographic findings could not be detected on radiographs. Different surgical procedures were carried out according to the form of cartilaginous connection.

scholarly journals Peculiarities of the chemical composition of fungal bodies of the paranasal sinuses

2021 ◽  
pp. 46-55
Author(s):  
Yaroslav V. Shkorbotun ◽  
Mykola A. Skoryk
Keyword(s):  
Chemical Composition ◽  
Chemical Elements ◽  
Dental Materials ◽  
Factor Group ◽  
High Radiation ◽  
Radiation Density ◽  
Fungal Ball ◽  
Group 3 ◽  
Group 2 ◽  
Group 1

Introduction: The significance of fungal microflora in the development of chronic rhinosinusitis tends to increase. The purpose of the study: We had studied the chemical composition of fungal bodies of odontogenic and nonodontogenic origin to determine the relationship between fungal sinusitis and previous endodontic treatment. Methods and materials: The 7 samples of the most common dental endodontic materials and 32 fungal ball removed from the paranasal sinuses in patients were examined by electron microscopy and masspectrometry: 22 of them were from the maxillary sinus in persons with a probable odontogenic cause of the disease (group 1), and 10 with the exception of odontogenic factor – 5 from the maxillary sinus - group 2 and 5 - from the sphenoid - group 3). The resultsand disscusion: In areas with high radiation density of fungal balls, its level in group 1 was 1173.6 ± 257.9 HU, groups 2 and 3 - 283.2 ± 21.8 HU and 262.6 ± 3 HU, and the radiation density from the samples with base it’s level in all groups did not differ among them and was from 50.1 to 55.0 HU. It was found that in all samples dental materials there was a content of Zn with a mass fraction from 0.71 ± 0.42% to 85.51 ± 0.05%. When analyzing the structure of fragments of fungal balls from areas with a base level of radiation density in patients of all three groups, its homogeneity and absence of crystalline inclusions were noted. In contrast, in fragments of fungal ball from areas of high radiation density there where a significant number of crystals in individuals with established odontogenic factor (group 1) and their absence in the material of groups 2 and 3. In the composition of samples of fungal balls from areas with high radiation density, it was found that in group №1 in 10 samples (45.45%) showed a significant content of Zinc (average mass fraction - 23.71 ± 4.45%), and Calcium was found in 40.9% of the samples at the level of 3.8 ± 1.33%. The chemical composition of areas of fungal bodies with high radiation density in individuals with excluded odontogenic factor (group 2 and group 3) was similar and was characterized by the presence of high level of Calcium from areas with increased radiation density of 24.38 ± 6.22%, and 22.04 ± 5,72%, while the background (group 2 - 1.26 ± 0.33%, group 3 –0.90 ± 0.34%). Zinc and other chemical elements - markers of dental materials in groups 2 and 3 were not detected. Conclusions: All dental materials we examined contain Zn and chemical elements are not characteristic of tissues of biological origin (Ba, Zr, W, Co and Ti), the content of which may cause increased radiological density of the tissue of the fungal ball. Elevated Zn and Ca content was detected in 45.45% and 40.9% of samples of fungal ball of odontogenic origin, and in almost all samples of fungal ball of neodontogenic origin, regardless of the location of the sinus (maxillary or sphenoidal), Ca was detected, which allows to predict the absorption of these chemicals. elements from the tissues surrounding the fungal body, as the main mechanism of their accumulation in concentrations that cause the formation of areas of high radiation density.

scholarly journals Profilometric and SEM analyses of composite surfaces after excess cement removal

2012 ◽  
Vol 66 (1) ◽  
pp. 59-66 ◽  
Author(s):  
Danimir Jevremovic ◽  
Zorica Ajdukovic ◽  
Sasa Stankovic ◽  
Radivoje Radosavljevic
Keyword(s):  
Surface Roughness ◽  
Surface Characteristics ◽  
Sem Analysis ◽  
Incomplete Removal ◽  
Significant Difference ◽  
Cement Removal ◽  
Group 3 ◽  
Group 2 ◽  
Cotton Roll ◽  
Composite Cements

Composite cements are widely used in dentistry, due to their positive characteristics (bond strength, color, low solubility etc.). However, removal of the cement presents one of the drawbacks of their use, since incomplete removal might cause bacterial adhesion, gingival irritation and subsequent inflammation. The aim of this study was to investigate surface characteristics of the composite cements after different ways of excess removal, by means of profilometric and SEM analysis. Thirty leucite reinforced ceramic specimens were divided into three groups, based on the manner of excess cement removal: Group 1 (polished): excess was fully polymerized for 40 s, then removed; Group 2 (cleaned): excess was removed with a cotton roll, after which cement was fully polymerized for 40 s; Group 3 (pre-polymerized): excess was light cured for 5 s, after which cement excess was broken with an instrument and then fully polymerized for 40 s. Surface roughness was measured using a surface profilometer. Subsequently, specimens were inspected by a scanning electron microscope. The data were statistically analyzed. The examination of variants of average values proved the statistically significant difference in the height of average values per group, p<0.0001; the statistically significantly highest values were for the pre-polymerized group, whereas the statistically significantly lowest values were for the polished group. Results of this study show that utmost attention has to be paid to the excess removal procedure, since surface roughness parameters directly depend on the choice of the applied technique.

scholarly journals Differences in surface roughness of nanohybrid composites immersed in varying concentrations of citric acid

2017 ◽  
Vol 50 (2) ◽  
pp. 102
Author(s):  
Gabriela Kevina Alifen ◽  
Adioro Soetojo ◽  
Widya Saraswati
Keyword(s):  
Surface Roughness ◽  
Citric Acid ◽  
Acid Solution ◽  
High Performance ◽  
Citric Acid Solution ◽  
Posterior Teeth ◽  
Significant Difference ◽  
Nanohybrid Composite ◽  
Group 3 ◽  
Group 2

Background: The surface roughness of restoration is important in predicting the length of time it might remain in the mouth. Conditions within the oral cavity can affect the surface roughness of a restoration. Nanohybrid composite is widely used in dentistry because it can be applied to restore anterior and posterior teeth. Athletes routinely consume isotonic drinks which are acidic and even more erosive than the carbonated variety because they contain a range of acids; the highest content of which being citric acid. Purpose: The aim of the study was to analyze the surface roughness of nanohybrid composite after having been subjected to immersion in varying concentrations of citric acid. Methods: Two isotonic drinks (Pocari Sweat and Mizone) were analyzed using high performance liquid chromatography (HPLC) to quantify the respective concentrations of citric acid which they contained. A total of 27 samples of cylindrical nanohybrid composite were prepared before being divided into three groups. In Group 1, samples were immersed in citric acid solution derived from Pocari Sweat. Those of Group 2 were immersed in citric acid solution derived from Mizone; while Group 3, samples were immersed in distilled water as a control. All samples were immersed for 7 days, before their surface roughness was tested by means of a surface roughness tester (Mitutoyo SJ-201). Data was analyzed using a one-way ANOVA test. Results: The results showed that there was no significant difference in surface roughness between Groups 1, 2 and 3 (p=0.985). Conclusion: No difference in surface roughness of nanohybrid composites results from prolonged immersion in varying concentrations of citric acid.

Influence of thermal and pH cycles on surface characteristics lithium disilicate glass-ceramic dental crowns milled with CAD/CAM process

2021 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Yajvinder Singh ◽  
Vishal Gulati
Keyword(s):  
Surface Roughness ◽  
Glass Ceramic ◽  
Research Work ◽  
Surface Hardness ◽  
Surface Characteristics ◽  
Lithium Disilicate ◽  
Content Type ◽  
Cad Cam ◽  
Group 3 ◽  
Group 2

Purpose The paper aims to evaluate the influence of thermo-chemical cycles of oral fluids on the surface attributes (roughness and microhardness) of lithium disilicate glass-ceramic (LDC) crown restorations manufactured with CAD/CAM technology. Design/methodology/approach There have been 24 LDC crowns manufactured using the CAD/CAM process for their respective preparation dies ply methyl methacrylate (PMMA) of mandibular left second premolar tooth (n = 8 each group). The standard procedure was used to glaze 16 crown samples (Groups 2 and 3).Samples of Group 3 were aged with thermal (563°C and 5563°C) and pH (2–14) cycles. All 24 samples were tested with a Profilometer and a Vicker hardness tester was used for their surface roughness and hardness measurement, respectively. Findings In statistical examination on SPSS Statistics 20 (IBM) software, of surface roughness values (Ra) and Vicker hardness values from different groups, Tukey HSD test was executed in one-way ANOVA (a = 0.05). The means Ra for groups were accordingly Group 3 > Group1 > Group 2 (p < 0.001). Similarly, micro-hardness was in order of Group 2 > Group 1 > Group 3 (p < 0.001). Research limitations/implications The research work does not have any limitations. Originality/value Surrounding temperature and pH significantly impact the surface characteristics of lithium disilicate crown restoration. The study also reveals the inverse relationship between surface roughness and surface hardness parameters. The observed results and facts revealed well in agreement with the past research studies.

The Effect of a Charcoal-based Powder for Enamel Dental Bleaching

2020 ◽  
Vol 45 (6) ◽  
pp. 618-623 ◽  
Author(s):  
MC Franco ◽  
JLS Uehara ◽  
BM Meroni ◽  
GS Zuttion ◽  
MS Cenci
Keyword(s):  
Surface Roughness ◽  
Randomized Study ◽  
Dental Enamel ◽  
Control Group ◽  
Dental Bleaching ◽  
Significance Level ◽  
Significant Difference ◽  
Group 3 ◽  
Group 2 ◽  
Group 1

Clinical Relevance Charcoal based-powders are not effective for dental bleaching. SUMMARY Charcoal-based dentifrices for dental whitening are a novelty in the market. Manufacturers claim that such charcoal-based products have whitening, remineralization, antimicrobial, and antifungal properties of charcoal in such products. However, there is no substantial scientific evidence for these claims. This laboratory randomized study was designed to evaluate the whitening properties of a charcoal-based toothpowder. A total of 45 bovine dental enamel discs were randomly distributed into three groups (n=15): group 1, mechanical brushing with a 1450-ppm F toothpaste (control group); group 2, mechanical brushing with an activated charcoal-based powder; group 3, bleaching per the standard protocol using 10% carbamide peroxide. The surface roughness and color of each specimen were analyzed at baseline and after 14 days of experiment. The surface of one randomly selected specimen from each group was examined using a scanning electron microscope (SEM). The Kruskal-Wallis test was used to compare groups at a significance level of 5%. Only group 3 promoted a statistically significant effect on ΔE compared with groups 1 and 2 (p&lt;0.001 and p=0.003, respectively). No statistically significant difference was found between groups for surface roughness (p&gt;0.05). SEM revealed a more irregular surface in group 1 specimens compared with group 2 and 3 specimens. The charcoal-based powder did not seem to have any bleaching effect.

scholarly journals EFEKTIVITAS LAYANAN BIMBINGAN KELOMPOK DALAM MENINGKATKAN ASERTIVITAS SISWA

2018 ◽  
Author(s):  
Firman - Firman
Keyword(s):  
Computer Software ◽  
Control Group ◽  
Significant Difference ◽  
Before And After ◽  
Equivalent Control ◽  
Kolmogorov Smirnov ◽  
Group 3 ◽  
The Difference ◽  
Group 2 ◽  
Group Guidance

Nowadays found some student at SMK N 9 Padang prefer to follow a decision of a friend than follow self decision. This research to reveal; 1) the difference assertiveness students group experiment before and after given group guidance 2) the difference assertiveness students the control group before and after without group guidance 3) the difference assertiveness student group experiment given group guidance with student the control group without given group guidance. This research is a quantitative with approach Quasi Experiment Design in type design the Non Equivalent Control Group. The population research was students of X Tata Boga SMK N 9 Padang and samples in this research chosen using a technique purposive sampling. The instrumen used the Questionare. Data then analyzed using Wilcoxon Signed Ranks Test and Kolmogorov Smirnov Two Independent Samples with program computer software Statistical Product and Service Solution (SPSS) Version 20. Based on the research, this research founds; 1) there are significant difference assertiveness students group experiment before and after given guidance group 2) there is no significant difference assertiveness students the control group before and after without given guidance group 3) there are significant difference assertiveness students the experiment group given guidance group with the control group without given guidance group.

scholarly journals Патофизиологические механизмы эпителиально-мезенхимальной трансформации при идиопатическом эпиретинальном фиброзе

2020 ◽  
Author(s):  
S.A. Borzenok ◽  
V.D. Zakharov ◽  
A.V. Miridonova ◽  
A. Kupriyanova ◽  
S.V. Kolesnik ◽  
...  
Keyword(s):  
Extracellular Matrix ◽  
Visual Acuity ◽  
Epithelial Mesenchymal Transition ◽  
Mesenchymal Phenotype ◽  
Mesenchymal Transition ◽  
Type Iv ◽  
Extracellular Matrix Components ◽  
Group 3 ◽  
Group 2 ◽  
Group 1

Эпителиально-мезенхимальная трансформация (ЭМТ) может лежать в основе перестройки дифференцированных клеток при репарации тканей и формировании фиброза. В основе патогенеза идиопатического эпиретинального фиброза (иЭРФ) могут также быть задействованы процессы дифференцировки и трансформации различных типов клеток. Цель исследования - выявление признаков мезенхимального фенотипа в клетках эпиретинальных мембран удаленных с поверхности сетчатки у пациентов с иЭРФ и различной остротой зрения. Методика. В исследование включено 60 пациентов (60 глаз) с диагнозом иЭРФ. Все пациенты были разделены на 3 группы по 20 пациентов в каждой, в зависимости от исходной максимально корригированной остроты зрения (МКОЗ): 1- я группа имела МКОЗ 0,9 -0,7 н/к; 2-я - 0,6-0,3 н/к; 3-я - от 0,2 до 0,05. У всех пациентов удаляли эпиретинальную и внутреннюю пограничную мембраны (ЭРМ и ВПМ). ЭРМ и ВПМ удаляли послойно или единым блоком. Проводили иммуногистохимическое окрашивание образцов мембран, с целью выявления и визуализации следующих антигенов: виментина, α-гладкомышечного актиа (α-SMА), и коллагенов IV и VI типов. Результаты. У пациентов 1-й группы во всех случаях ЭРМ удалялись отдельно от ВПМ. В образцах выявлялись единичные клетки экспрессирующие виментин, α-SMA, коллагены IV и VI типов. У пациентов 2-й группы в 16 случаях (80%) ЭРМ с поверхности сетчатки удалялись единым блоком с ВПМ. В образцах выявлено увеличение числа клеток экспрессирующих α-SMА и виментин, при этом имело место статистически значимое увеличение экспрессии коллагенов IV и VI типов. Во всех образцах 3-й группы ЭРМ и ВПМ в 100% случаях удалялись с поверхности сетчатки единым блоком. В 17 (85%) случаях мембраны имели один или несколько участков сращения с сетчаткой, в клетках превалировала экспрессия коллагенов VI и VI типов. Маркеры виментин, α-SMA, коллагены VI и VI типов обнаруживали статистически значимую корреляционную связь с МКОЗ до операции. Причем, виментин имел сильную обратную корреляционную связь (r=-0,788, p=0,004), факторы α-SMA и коллагены IV, VI типов - очень сильную обратную корреляционную связь (r<-0,9, p<0,001). Заключение. На примере прогрессирования идиопатического эпиретинального фиброза выявлена ЭМТ мембран. Данный феномен характеризуется приобретением клетками мембраны мезенхимального фенотипа: появлением экспрессии виментина и α-SM актина а также и приобретением способности к продуцированию компонентов внеклеточного матрикса (коллагены IV и VI типов). Ключевым моментом в процессе формирования и прогрессирования ЭРФ является трансформация клеточного состава в миофибробластоподобные клетки. Повышенная экспрессия α-SM актина непосредственно связана с сокращением мембраны и «натяжением» сетчатки миофибробластами, что в свою очередь приводит к прогрессирующему снижению остроты зрения и увеличению метаморфопсий у пациентов (r<-0,9, p<0,001).Epithelial-mesenchymal transition may underlie reorganization of mature differentiated cells and tissues during their repair and fibrosis. The pathogenesis of idiopathic epiretinal fibrosis may also involve processes of differentiation and transformation of different cell types. Aim. To identify signs of the mesenchymal phenotype in cells of idiopathic epiretinal membranes removed from the surface of the retina in patients with different visual acuity. Methods. Sixty eyes of 60 patients with idiopathic epiretinal fibrosis were divided into three groups: Group 1 included patients with best-corrected visual acuity (BCVA) 0.7-0.9; group 2 consisted of patients with BCVA 0.3-0.6; and group 3 consisted of patients with BCVA 0.1-0.3. In all patients, the internal limiting membrane (ILM) was peeled for idiopathic epiretinal membrane (IERM). Idiopathic ERM/ILM samples from vitrectomy were analyzed for vimentin, α-smooth muscle actin (α-SMA), and type IV and VI collagens using flat-mount immunohistochemistry. Results. In patients of group 1, single cells expressing vimentin, α-SMA, and type VI and VI collagens were found. In patients of group 2, the number of cells expressing α-SMA and vimentin was increased with a statistically significant increase in the expression of type IV and VI collagens (p <0.05). Type VI and IV collagens prevailed (p <0.05) in all samples of group 3. Sometimes membranes had sites of rough fusion with extracellular matrix components. These membranes strongly adhered to ILM and were removed as a single block during vitrectomy. Conclusion. Using the example of progressive idiopathic epiretinal fibrosis this study found the epithelial-mesenchymal transition. This phenomenon was characterized by membrane cells that have acquired the mesenchymal phenotype due to appearance of vimentin and α-SM actin expression (p <0.05) as well as the ability to produce components of extracellular matrix (type IV and VI collagens) (p <0.05). The key point in the process of ERM formation and progression was the transformation of the cellular composition into myofibroblast-like cells. The increased expression of α-SM actin was associated with membrane contraction and tensioning of the retina by myofibroblasts, which resulted in impaired visual acuity and increased metamorphopsia (r <-0.9, p <0.001).

scholarly journals Efek Perendaman Air Jeruk Nipis dan Air Jeruk Lemon pada Kekasaran Permukaan Semen Ionomer Kaca

2018 ◽  
Vol 7 (2) ◽  
pp. 11
Author(s):  
Rosalina Tjandrawinata ◽  
Andreas Julianto
Keyword(s):  
Surface Roughness ◽  
Mineral Water ◽  
Glass Ionomer Cement ◽  
Lemon Juice ◽  
Lime Juice ◽  
Significant Difference ◽  
Food And Beverage ◽  
Group 3 ◽  
Group 2 ◽  
Group 1

The surface of Glass Ionomer Cement (GIC) restoration changes because of mastication forces, shear force, other functional forces, and also tooth brushing process. Things that can also change the surface of GIC restoration is kind of food and beverage consumption, such as in Indonesia, lime and lemon juice are usual beverage, and mixed in food. The purpose of this study is to determine the changes in surface roughness of GIC restoration due to lime and lemon juice immersion. Three groups GIC sample, each of ten samples were 5 mm in diameter and 2.5 mm in height. Group 1 was immersed in mineral water (as control) for 10 days. In 10 days, Group 2 was immersed in lime juice, each day 9 times @ 15 minutes and brushed with soft toothbrush for 9 times @ 3 minutes. Similar way with group 2, 10 samples of group 3 was immersed in lemon juice. Samples immersed in mineral water show changes in surface roughness of 0.977+0.503 μm, while samples immersed in lime juice show 4.267+1.489 μm, and samples immersed in lemon juice show 4.293+1.311 μm. One way ANOVA test shows significant differences among the samples (p<0.05). Post hoc Tukey test shows significant difference (p<0.05) between group 1 and group 2 and between group 1 and group 3. However, there is no significant difference between group 2 and group 3 (p>0.05). Conclusion, lime juice and lemon juice cause changes in the surface roughness of GIC more than mineral water.

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